The invention discloses a piperine deinsectization bactericidal agent by taking the piperine as an effective component and is prepared by mixing piperine, natural pyrethrin, matrine, hodorine, nicotine, synergistic agent, preservative, emulsifier, surface active agent, stabilizer, pH regulator, defoamer and solvent. The invention belongs to a plant source deinsectization bactericidal agent with the advantages of unambiguous effective components and easily controlled product quality, which adopts a proper accessory ingredient such as the emulsifier and stabilizer, etc., to solve the key problems of degradation and unstable quality and has no toxicity and residue, environment-friendliness and broad-spectrum effective deinsectization bactericidal effect. The invention has remarkable killing and controlling effects on various pests and germs in wheat, rice, fruit trees, vegetables, flowers, storehouses, houses as well as forests, has remarkable controlling effects on sanitary insect pests and germs like mosquito, fries, black beetles, ants, bedbugs, moth flies and fleas, etc, which is used for controlling pests and various germs for grains like paddy, wheat, corn, broomcorn, etc., during a storage period with a remarkable effect.